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Lesson Plan: Front-End Estimation Strategy: Two-Digit Numbers

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to estimate the sum and difference of two two-digit numbers using the front-end estimation strategy.

Objectives

Students will be able to

  • identify the digit with the highest place value in a two-digit number,
  • round two digits to the highest place value,
  • estimate the sum of two-digit numbers by rounding to the highest place value,
  • estimate the differences between two-digit numbers by rounding to the highest place value,
  • reflect on the accuracy of using the front-end estimation strategy.

Prerequisites

Students should already be familiar with

  • place values of two-digit numbers,
  • multiples of 10,
  • addition and subtraction of two-digit numbers.

Exclusions

Students will not cover

  • three-digit front-end estimation,
  • other estimation strategies.

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